Controlling Access to Your AWS GovCloud (US)
Account

Your AWS GovCloud (US) account credentials grant full access to your AWS GovCloud
(US)
account. We recommend that you don't share your account credentials. Instead, use
AWS Identity and Access Management (IAM) to grant users access to AWS GovCloud (US).
With IAM, you can control
who can perform which actions on a specific resource. Signing Up for AWS GovCloud (US)
discusses how you create your first IAM administrative user.